Questions tagged [supernova]
Questions regarding stars which increase suddenly in energy output due to an explosion which ejected much of its mass.
279
questions
-4
votes
0
answers
50
views
When a star goes supernova, what happens to the material?
Specifically,
How much of the star becomes cosmic rays?
How much becomes neutrinos?
How much becomes a neutron star or BH?
How much remains local to the star and turns into the crab nebula?
What ...
- 2,371
8
votes
1
answer
1k
views
With 42 supernovae in 37 galaxies, how do we know SH0ES results is robust?
SH0ES is a collaboration that's anchoring the cosmic distance ladder by matching Cepheid data with Type 1a supernovae. Both of these are standard candles, so if we know the distance to a particular ...
- 4,831
4
votes
1
answer
111
views
Probability of exoplanets getting ejected by supernova
The large population of rogue planetary mass objects in our galaxy is often stated to have stemmed from gravitational ejection from a young system of from the collapse of small gas clouds. But I've ...
- 746
3
votes
1
answer
101
views
Can a relatively small addition of matter to a small volume of a star turn it into a supernova?
Can a relatively small addition of matter to a small volume of a star turn it into a supernova?
The rate of fusion in the CNO cycle increases very rapidly with increasing temperature, as shown in the ...
- 339
16
votes
1
answer
2k
views
Do amateurs still search for supernovae?
When I was little, I read Sky and Telescope, and I was always delighted when I saw that an amateur had discovered a supernova.
Now I imagine that even amateurs can do that process automatically. There'...
- 2,371
14
votes
2
answers
4k
views
Are there really half-a billion visible supernovae exploding all the time?
By comparing 2 deep fields, NASA found 80 active supernovas in an area of the sky that's a rice grain at arm's length.
This guy on YouTube says it means there are HALF A BILLION supernovas exploding ...
- 2,371
10
votes
2
answers
2k
views
How are neutrinos able to cause a supernova explosion?
I was trying to understand the type II supernovae's core collapse mechanism from Wikipedia.
As the core's density increases, it becomes energetically favorable for electrons and protons to merge via ...
- 385
1
vote
1
answer
114
views
Does the lower value of the Hubble Constant predicted by the Planck Satellite and now confirmed by Wendy Freedman invalidate the idea of dark energy?
Is the dark energy part of the Lambda-CDM model (the 'lambda') still necessary if the value of the Hubble 'constant' is lower than that predicted by Adam Reiss and collaborators when they examined ...
- 5,437
5
votes
2
answers
504
views
White dwarf supernova luminosity
I understand that the mass limit for a white dwarf is 1.4 solar masses, and therefore approaching it would cause a white dwarf (type Ia) supernova, and thus it is a standard candle. I understand this ...
- 173
4
votes
1
answer
97
views
Nature of Supernova Ejecta: Solid Chunks vs. Gas/Dust?
When a supernova explodes, does it eject chunks of solid material in the form of asteroids (of any size) or is it all just dust and gas that later clumps together into bigger solid objects? Or is all ...
- 553
6
votes
1
answer
175
views
Why does a white dwarf sometimes go 'nova' and sometimes supernova (type 1a)?
Obviously, when a white dwarf goes truly supernova, there is nothing left, not even, I have heard, a neutron star or black hole...
But when certain white dwarf stars accrete certain amounts or types ...
- 5,437
1
vote
1
answer
69
views
What's the official process for confirming then naming supernovae (e.g. Requiem and Encore)?
I saw this NASA Webb Telescope tweet:
Supernova 2: Galactic Boogaloo
In 2016, @NASAHubble saw a supernova named Requiem in a distant galaxy. Now Webb has found a second supernova named Encore — ...
- 30.6k
21
votes
4
answers
6k
views
What would happen if a small black hole fell into a star?
Let's say you created a cannon that can shoot small black holes and you shoot it at some star.
Would the star just turn into a black hole silently? Or rather first destabilize and produce a last ...
- 431
0
votes
1
answer
215
views
Betelgeuse, placing light bulb so that its apparent brightness is similar to that of Betelgeuse; wavelength where it shines brightest?
The giant star Betelgeuse will develop into a supernova in the future. After this event, his remains will be far too dark to be observed from Earth. In order to maintain the view of the starry sky, it ...
- 71
9
votes
1
answer
1k
views
Why did it take so long for SN1987A to reach peak brightness?
The light from SN1987A first reached us on February 23, 1987, and its brightness peaked in mid May, almost 3 months later.
However, every source that I can find states that it normally only takes a ...
- 969
1
vote
0
answers
33
views
Differentiating supernova types with light curves
as an introductory activity for my work on transients, I am studying the light curves of different supernovae. It appears that Type-I supernovae have a more pronounced maximum than Type-II supernovae. ...
- 779
0
votes
1
answer
105
views
3rd brightest ever object in the sky
What’s the 3rd brightest ever recorded object in the sky?
For example Venus is normally the 3rd brightest object in the sky.
However there have been the occasional comet or Supernova that have ...
- 969
2
votes
1
answer
103
views
Measuring Expansion Rate of Crab Nebula with Radio Spectrum Scan
I am a high school student who is into radio astronomy, and I have the opportunity to use Green Bank’s 20m radio telescope for a practice research project. I would like to use my observations to very ...
- 21
1
vote
0
answers
84
views
How did the Cassiopeia A Supernova go unobserved?
The Cassiopeia A was caused by a Supernova estimated to have taken place around the late 17th century. The Remnant's declination means that it would be Circumpolar for anyone north of 30N, and it's ...
- 969
4
votes
0
answers
156
views
If a Milky Way supernova were to happen, how long would it take for astronomers to be notified?
If a Supernova were to happen in the Milky Way, how long would it take for astronomers to be notified?
How long would it take for the people running the gravitational wave and neutrino detectors to ...
- 969
2
votes
1
answer
86
views
Could we detect neutrinos from a supernova in Andromeda?
Could we detect neutrinos from a supernova in Andromeda?
Are our neutrino detectors sensitive enough to do so?
They detected 13 neutrinos from SN1987A, which was 186,000 light years away, but our ...
- 969
6
votes
1
answer
588
views
Intuitive connection between the periods of oscillation of Betelgeuse and the elemental concentrations at its core? (Betelgeuse; Saio et al. (2023))
Preamble (yes it's long, but it's part of this question's premise, so need to spell it out)
Dr. Becky's recent video New study claims Betelgeuse supernova IMMINENT (decades not centuries!) | Night Sky ...
- 30.6k
1
vote
1
answer
43
views
How do they see BOTH "anomalously cool with a significant mid-IR excess" rather than one or the other? (SN 2023ixf progenitor)
The abstract of the arXiv preprint SN 2023ixf in Messier 101: A Variable Red Supergiant as the Progenitor Candidate to a Type II Supernova (itself recently "discovered" in the observatory) ...
- 30.6k
4
votes
1
answer
545
views
Has the new type II supernova SN 2023ixf's subtype been determined yet, and is a tentative light curve possible? Is it still getting brighter?
Wikipedia's article on SN 2023ixf begins:
SN 2023ixf is a type II (core collapse) supernova located in the Pinwheel Galaxy (M101). It was first observed on May 19, 2023 by Koichi Itagaki and ...
- 30.6k
0
votes
1
answer
96
views
When dark energy became significant 6 billion years after the Big Bang was there anything else of significance going on in the universe?
I read that a lot of supernovas appeared at this time but were other major events or phenomenon occurring? I ask this in case there could be some physical process helping dark energy to strengthen or ...
user50918
1
vote
3
answers
112
views
Does the Drake equation consider how far a planet must be from gamma ray bursters, black holes supernovae etc for life to survive?
Can we use these dangerous phenomena to predict where life can't exist?
user50918
-3
votes
1
answer
84
views
Can the distribution of Al28 across the Earth tell us if the solar system formed from a gas cloud that collapsed itself or by a supernova explosion?
A single supernova could have collapsed a gas cloud and left Aluminium 28 on one side of the Earth . If there were many supernovae in all directions that gradually sent material to Earth then the ...
user50623
14
votes
1
answer
2k
views
Could it be possible to detect planets from stars that went supernova through the resulting nebula shape?
It ocurred me, if a star with at least one planetary companion undergoes a nova or supernova, we shoud expect the debris to be deflected to some degree, on exit. To ilustrate it, first let's take the ...
- 1,201
2
votes
0
answers
37
views
Which value of the apparent magnitude do I use from a Supernova light curve
I am trying to get the distance modulus from a light curve of a supernova and obviously the apparent magnitude changes with time. Not only that but there are so many filters with different mags.
So my ...
- 53
2
votes
2
answers
109
views
Supernova remnant spectral lines
I have some trouble to find which spectral lines are the ones in this SNR N49 fitted spectrum.
They are at 1.3 keV, 1.9keV, 2.5keV, 3.2keV, 3.95keV and maybe at 0.65keV and 6.8keV (approximately).
...
- 415
3
votes
0
answers
35
views
Supernova remnant and ejecta "bullet"
I'm making an X-ray analysis of the source SNR N49. It has a magnetar inside of it that is emitting strongly in Soft ([0.2-1.2] keV), Medium ([1.2-2.5] keV), and Hard ([2.5-8.0] keV) bands.
I was ...
- 415
3
votes
1
answer
105
views
How to obtain luminosity distance from a light curve
I have some light curve data of a SN Ia from which I want to find the luminosity distance $D_L$.
How can I do it mathematically?
I'll then try to implement the answer using Python.
- 53
5
votes
1
answer
660
views
How does the Chandrasekhar limit relate to the ignition of carbon in white dwarf stars?
Why carbon in white dwarfs ignites (deflagrate, detonate) at the Chandrasekhar limit? The limit relates stability of the star made of degenerate electron Fermi gas to the white dwarf mass without a ...
- 1,074
1
vote
1
answer
82
views
How do remnants of supernova have a magnetic field which cause the insane speed of cosmic rays?
If a star undergoes a supernova explosion, how does it retain its magnetic field to excite the moving particles to near speed of light velocities as stated in observations of NASA?
- 171
3
votes
1
answer
154
views
After a Type Ia supernova explosion, what becomes of the degenerate matter?
A white dwarf below 1.44 solar mass in a binary system may accrete mass from its companion. If its core reaches the temperature for carbon fusion during this process, the white dwarf may reignite in a ...
- 133
3
votes
0
answers
105
views
What would be the effect of WR104 if it was at the distance of Alpha Centauri and pointed at us?
If WR104 was at the distance of Alpha Centauri and its pole pointed at us when it went off what effect would it have? How badly would Earth be scorched?
If we were sitting right on the cannon’s mouth, ...
- 661
2
votes
0
answers
26
views
Where can I get data on supernovae captured both by the Hubble and an earth telescope?
I want to compare data on supernovae that are both captured by the Hubble telescope and at least by one earthly telescope. The problem - where can I get this data?
- 21
1
vote
0
answers
29
views
Are there any experiments or observations indicating that the Hubble flow can influence AGNs, quasars and galactic winds (outflows)?
Galactic winds (or outflows) are produced by AGNs (Active Galactic Nuclei), quasars, supernovas...etc which basically eject matter usually in form of waves or spheres, sometimes even arriving to the ...
- 1,273
3
votes
0
answers
64
views
Gamma ray bursts and global cooling
I watched the latest video of kurzgesagt channel, which is regarding supernova/gamma ray bursts, and its effects on earth. In the video he explains how gamma ray bursts or supernovas affect our earth. ...
- 385
3
votes
1
answer
117
views
How do I determine the Luminosity with a half-life decay?
I know there is a proportionality between the luminosity and $\frac{dN}{dt}$, but I am not sure why they are proportional and why there is a need for an initial mass to compute the luminosity if the ...
- 41
2
votes
1
answer
77
views
How are the products of stellar nucleosynthesis sorted as found in planets?
Stellar nucleosynthesis is responsible for creating the elements heavier than lithium (except perhaps some of the heaviest that might result from neutron star collisions).
Eventually, the star goes ...
- 21
3
votes
0
answers
107
views
Are there any binary red supergiants?
I wonder if we ever have identified or observed a pair of binary stars (red supergiants). And I also wonder what would happen if they exploded, (theoretically) as we haven’t observed it. Also, would ...
5
votes
1
answer
65
views
How to interpret illumination in "pulsar cannonball" image
This beautiful image (from APOD) looks like the trail of the ejected pulsar is illuminating a ball of gas and dust. My eye sees patches of light and shadow, but sometimes images can be deceptive. What ...
- 3,944
3
votes
1
answer
142
views
If a supernova explodes all it's comets into space, can they reach a big number of star systems?
If there's DNA life that arises on a warm planet 2 billion years after the big bang, and meteorite collisions on the planet propagate DNA unicellular organisms into millions of icy rocks orbiting the ...
- 4,278
6
votes
1
answer
239
views
How does metallicity reduce the likelihood of black hole formation?
Large stars collapse and if they are large enough form black holes. But the likelihood reduces with metallicity.
What mechanism facilitates this? I believe it has something to do with opacity and ...
- 163
9
votes
1
answer
432
views
Do pop III stars undergo supernova or direct collapse?
Population III stars were the first stars to form. They are hypothesised as being very massive, i.e., > 100 M$_{\odot}$. My question regards how do these stars end their lives?
An old orthodoxy for ...
- 4,533
29
votes
2
answers
6k
views
When stars explode after running out of fuel, why are new stars born from the remnants?
I'm not a physicist or have a very good physics background but I've often wondered why there are new stars that are born in the nebula which was created after the parent star has exploded. As I ...
- 393
4
votes
1
answer
302
views
Acronyms in astrophysics: is there a place that collects them all anywhere on the internet? And what does PSN mean on the TNS server?
Acronyms in astrophysics: is there a place that collects them all anywhere on the internet? And what does PSN mean on the TNS server?
Is it "possible supernova" or "pulsar" ...
2
votes
1
answer
105
views
Do supernova remnant nebula re-collapse into a star?
We know that nebula sometimes collapse into stars. The particles are attracted to the joint gravitational center of the whole nebula.
One type of nebula is a supernova remnant nebula. Unlike a normal ...
- 624
2
votes
1
answer
88
views
What criteria determines whether stars are supernova type II candidates?
I want to find supernova candidates by using the Gaia catalog in 300 parsec (near Earth). I though they must be red super giants so they are cooler than 4100 K and more luminous than 104 solar ...
- 109